The report also found this Parmesan cheese in particular actually contained no Parmesan cheese at all, but rather, other types of cheaper cheeses like Swiss, mozzarella and white cheddar.

And while you actually won't ever see "wood pulp" listed as an ingredient on a tub of grated so-called 100 per cent Parmesan cheese, "cellulose" is the culprit you might just find on many packaged goods.

"Cellulose used in food is sometimes derived from, yes, wood. It's used as a thickener, anti-clumping agent, or to make products creamier, and it's in a ton of food products, from salad dressing to cheese to burgers."

But Langer says it's completely safe.

"I think it's just because 'wood in your food' sounds gross that people are freaking out about it, but why not freak out about the chemicals in the same food that are not some harmless fibre derived from plants?"

"I think it's just because 'wood in your food' sounds gross that people are freaking out about it, but why not freak out about the chemicals in the same food that are not some harmless fibre derived from plants?" —Abby Langer, RD